TREA

Werner Grommas

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  • Dortmund, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pressure-relief valve devices
    • Patent number 4,790,347
    • Issue date Dec 13, 1988
    • Gewerkschaft Eisenhutte Westfalia GmbH
    • Walter Weirich
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Actuator for a mine roof support unit
    • Patent number 4,394,875
    • Issue date Jul 26, 1983
    • Gewerkschaft Eisenhutte Westfalla
    • Walter Weirich
    • E21 - EARTH DRILLING MINING